29 Arietis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 32m 54.14202s |
| Declination | +15° 02′ 04.3103″ |
| Apparent magnitude (V) | 6.00 |
| Characteristics | |
| Spectral type | F7 V + G5 V + ? |
| B−V color index | 0.572±0.006 |
| Astrometry | |
| Radial velocity (Rv) | 9.1±2.5 km/s |
| Proper motion (μ) | RA: −20.557 mas/yr Dec.: +50.206 mas/yr |
| Parallax (π) | 34.8568±0.1313 mas |
| Distance | 93.6 ± 0.4 ly (28.7 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.2/5.0 |
| Orbit | |
| Period (P) | 19.4161±0.0005 d |
| Eccentricity (e) | 0.4096±0.0033 |
| Longitude of the node (Ω) | 179.09±0.44° |
| Periastron epoch (T) | 2,454,101.914±0.018 JD |
| Semi-amplitude (K1) (primary) | 23.36±0.09 km/s |
| Details | |
| 29 Ari A | |
| Mass | 1.14 M☉ |
| Radius | 1.59+0.07 −0.05 R☉ |
| Luminosity | 3.27 L☉ |
| Surface gravity (log g) | 4.12 cgs |
| Temperature | 6,063±114 K |
| Metallicity [Fe/H] | 0.09 dex |
| Age | 3.0±1.8 Gyr |
| 29 Ari B | |
| Mass | 0.88 M☉ |
| Temperature | 5,270±170 K |
| Other designations | |
| 29 Ari, BD+14°419, FK5 2176, GJ 3161, HD 15814, HIP 11843, HR 741, SAO 92998, WDS J02329+1502 | |
| Database references | |
| SIMBAD | data |
29 Arietis is a triple star system in the northern constellation of Aries. 29 Arietis is the Flamsteed designation. Its annual parallax shift of 34.86±0.13 mas indicates a distance of about 94 light-years (29 parsecs) from Earth. The system is barely visible to the naked eye with an apparent visual magnitude of 6.0; it is 0.02 degree north of the ecliptic. It is moving further from Earth with a heliocentric radial velocity of 9 km/s.
The core of the system is formed by a close spectroscopic binary with an angular separation of 3.892 mas, a semimajor axis of 0.15692±0.00086 AU, an orbital period of 19.4 days, and an eccentricity of 0.4. The larger member of this pair has 114% of the mass of the Sun, while its companion has 88% of the Sun's mass. Orbiting the pair at an angular separation of 1.422 arcseconds over a period of 164 years, the tertiary component has 52% of the Sun's mass.